ISHS Acta Horticulturae 427: Strategies to Optimize Wine Grape Quality
WATER MANAGEMENT: A METHOD TO IMPROVE PHYSIOLOGICAL ACTIVITY IN ‘TEMPRANILLO’ GRAPEVINES UNDER FIELD CONDITIONS IN A SEMIARID CLIMATE |
| Authors: | M.C. Bartolomé, V. Sotés, C. Ruiz, P. Baeza, J.R. Lissarrague |
| Keywords: | Vitis vinifera, irrigation, leaf water potential, gas exchange, fruit yield, soluble solids |
| Abstract:
Responses to irrigation were investigated for Tempranillo grapevines, grown under field conditions in a semiarid climate. Non-irrigated vines were compared to trikle irrigated ones which received water throughout the growing season. The water supply accounted for 0.6 ET0 (potential evapotranspiration). Leaf water potential and gas exchange were measured in mid and late season. In both treatments, diurnal patterns of leaf water potential, stomatal conductance and net photosynthesis decreased by the second date of measurements, although a larger decrease was found in the stress treatment due to water deficit and leaf senescence. In order to survive under drought conditions, stressed Tempranillo vines conserved water by reducing transpiration rates through stomatal closure. In the irrigated treatment, a larger leaf area and higher photosynthesis resulted in similar soluble solids as those of the non-irrigated vines while having a larger fruit yield. | |
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